Broadband graphene terahertz modulators enabled by intraband transitions
Broadband graphene terahertz modulators enabled by intraband transitions
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DOI：
10.1038/ncomms1787
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发表时间：
2012-04-01
影响因子：
16.6
通讯作者：
Xing, Huili Grace
中科院分区：
文献类型：
--
作者：
Sensale-Rodriguez, Berardi;Yan, Rusen;Xing, Huili Grace
太赫兹技术承诺了无数的应用，包括成像、光谱分析和通信。然而，目前这一领域发展的一个主要瓶颈是缺乏有效的装置来操纵太赫兹电磁波。在这里，我们证明了使用石墨烯可以实现在室温下非常有效的太赫兹波的宽带调制，并且具有极低的本征信号衰减。我们在实验上实现了比以前的宽带强度调制器高2.5倍以上的调制，这也是第一个被证明完全由带内跃迁实现的基于石墨烯的器件。与传统半导体相比，石墨烯的独特优势是易于集成，以及空穴非凡的输运性质，由于石墨烯的对称锥形能带结构，这些空穴的输运性质与电子一样好。鉴于基于石墨烯的太赫兹发射器和探测器的最新进展，石墨烯可能会为太赫兹技术提供一些有趣的解决方案。
Terahertz technology promises myriad applications including imaging, spectroscopy and communications. However, one major bottleneck at present for advancing this field is the lack of efficient devices to manipulate the terahertz electromagnetic waves. Here we demonstrate that exceptionally efficient broadband modulation of terahertz waves at room temperature can be realized using graphene with extremely low intrinsic signal attenuation. We experimentally achieved more than 2.5 times superior modulation than prior broadband intensity modulators, which is also the first demonstrated graphene-based device enabled solely by intraband transitions. The unique advantages of graphene in comparison to conventional semiconductors are the ease of integration and the extraordinary transport properties of holes, which are as good as those of electrons owing to the symmetric conical band structure of graphene. Given recent progress in graphene-based terahertz emitters and detectors, graphene may offer some interesting solutions for terahertz technologies.